| 1 | /* |
| 2 | * SPDX-License-Identifier: MIT |
| 3 | * |
| 4 | * Copyright (C) 2010-2019 EfficiOS Inc. and Linux Foundation |
| 5 | */ |
| 6 | |
| 7 | #ifndef BABELTRACE2_GRAPH_MESSAGE_ITERATOR_H |
| 8 | #define BABELTRACE2_GRAPH_MESSAGE_ITERATOR_H |
| 9 | |
| 10 | #ifndef __BT_IN_BABELTRACE_H |
| 11 | # error "Please include <babeltrace2/babeltrace.h> instead." |
| 12 | #endif |
| 13 | |
| 14 | #ifdef __cplusplus |
| 15 | extern "C" { |
| 16 | #endif |
| 17 | |
| 18 | /*! |
| 19 | @defgroup api-msg-iter Message iterator |
| 20 | @ingroup api-comp-cls-dev |
| 21 | |
| 22 | @brief |
| 23 | Iterator of a \bt_msg sequence. |
| 24 | |
| 25 | A <strong><em>message iterator</em></strong> iterates a sequence of |
| 26 | \bt_p_msg. |
| 27 | |
| 28 | A message iterator is the \bt_name mechanism for the \bt_p_comp of a |
| 29 | trace processing \bt_graph to exchange information. This information |
| 30 | takes the form of a sequence of individual messages which contain |
| 31 | trace data (\bt_p_ev, for example). |
| 32 | |
| 33 | A message iterator is a \bt_msg_iter_cls instance. Because a message |
| 34 | iterator class is part of a \bt_src_comp_cls or \bt_flt_comp_cls, a |
| 35 | message iterator is part of a \bt_src_comp or \bt_flt_comp. Borrow |
| 36 | a message iterator's component with |
| 37 | bt_message_iterator_borrow_component(). |
| 38 | |
| 39 | A message iterator is a \ref api-fund-shared-object "shared object": get |
| 40 | a new reference with bt_component_get_ref() and put an existing |
| 41 | reference with bt_component_put_ref(). |
| 42 | |
| 43 | The type of a message iterator is #bt_message_iterator. |
| 44 | |
| 45 | There are two contexts from which you can create a message iterator: |
| 46 | |
| 47 | <dl> |
| 48 | <dt>From another message iterator</dt> |
| 49 | <dd> |
| 50 | This is the case for a \bt_flt_comp's message iterator. |
| 51 | |
| 52 | Use bt_message_iterator_create_from_message_iterator(). |
| 53 | |
| 54 | You can call this function from any message iterator |
| 55 | \ref api-msg-iter-cls-methods "method" except the |
| 56 | \ref api-msg-iter-cls-meth-fini "finalization method". |
| 57 | </dd> |
| 58 | |
| 59 | <dt>From a \bt_sink_comp</dt> |
| 60 | <dd> |
| 61 | Use bt_message_iterator_create_from_sink_component(). |
| 62 | |
| 63 | You can call this function from a sink component |
| 64 | \ref api-comp-cls-dev-methods "method" once the trace processing |
| 65 | graph which contains the component is |
| 66 | \ref api-graph-lc "configured", that is: |
| 67 | |
| 68 | - \ref api-comp-cls-dev-meth-graph-configured "Graph is configured" |
| 69 | method (typical). |
| 70 | |
| 71 | - \ref api-comp-cls-dev-meth-consume "Consume" method. |
| 72 | </dd> |
| 73 | </dl> |
| 74 | |
| 75 | When you call one of the creation functions above, you pass an \bt_iport |
| 76 | on which to create the message iterator. |
| 77 | |
| 78 | You can create more than one message iterator on a given |
| 79 | <em>\ref api-port-prop-is-connected "connected"</em> input port. The |
| 80 | \bt_p_conn between \bt_p_port in a trace processing \bt_graph establish |
| 81 | which \bt_p_comp and message iterators can create message iterators of |
| 82 | other \bt_p_comp. Then: |
| 83 | |
| 84 | - Any \bt_sink_comp is free to create one or more message iterators |
| 85 | on any of its connected input ports. |
| 86 | |
| 87 | - Any message iterator is free to create one or more message iterators |
| 88 | on any of its component's connected input ports. |
| 89 | |
| 90 | The following illustration shows a very simple use case where the |
| 91 | \ref api-comp-cls-dev-meth-consume "consuming method" of a sink |
| 92 | component uses a single \bt_flt_comp's message iterator which itself |
| 93 | uses a single \bt_src_comp's message iterator: |
| 94 | |
| 95 | @image html msg-iter.png |
| 96 | |
| 97 | Many message iterator relations are possible, for example: |
| 98 | |
| 99 | @image html msg-iter-complex.png |
| 100 | |
| 101 | <h1>\anchor api-msg-iter-ops Operations</h1> |
| 102 | |
| 103 | Once you have created a message iterator, there are three possible |
| 104 | operations: |
| 105 | |
| 106 | <dl> |
| 107 | <dt> |
| 108 | \anchor api-msg-iter-op-next |
| 109 | Get the message iterator's next messages |
| 110 | </dt> |
| 111 | <dd> |
| 112 | This operation returns a batch of the message iterator's next |
| 113 | \bt_p_msg considering its current state. |
| 114 | |
| 115 | This operation returns a batch of messages instead of a single |
| 116 | message for performance reasons. |
| 117 | |
| 118 | This operation is said to \em advance the message iterator. |
| 119 | |
| 120 | Get the next messages of a message iterator with |
| 121 | bt_message_iterator_next(). |
| 122 | </dd> |
| 123 | |
| 124 | <dt> |
| 125 | \anchor api-msg-iter-op-seek-beg |
| 126 | Make the message iterator seek its beginning |
| 127 | </dt> |
| 128 | <dd> |
| 129 | This operation resets the message iterator's position to the |
| 130 | beginning of its \ref api-msg-seq "message sequence". |
| 131 | |
| 132 | If the operation is successful, then the next call to |
| 133 | bt_message_iterator_next() returns the first \bt_p_msg of the |
| 134 | message iterator's sequence. |
| 135 | |
| 136 | If bt_message_iterator_seek_ns_from_origin() returns something |
| 137 | else than #BT_MESSAGE_ITERATOR_SEEK_BEGINNING_STATUS_OK, you |
| 138 | \em cannot call bt_message_iterator_next() afterwards. In that case, |
| 139 | you can only call bt_message_iterator_seek_beginning() again or |
| 140 | bt_message_iterator_seek_ns_from_origin(). |
| 141 | |
| 142 | Before you call bt_message_iterator_seek_beginning() to make |
| 143 | the message iterator seek its beginning, check if it can currently |
| 144 | do it with bt_message_iterator_can_seek_beginning(). |
| 145 | </dd> |
| 146 | |
| 147 | <dt> |
| 148 | \anchor api-msg-iter-op-seek-ns |
| 149 | Make the message iterator seek a message occurring at or after a |
| 150 | given time (in nanoseconds) from its clock class origin |
| 151 | </dt> |
| 152 | <dd> |
| 153 | This operation changes the position of the message iterator within |
| 154 | its \ref api-msg-seq "sequence" so that the next call to |
| 155 | bt_message_iterator_next() returns \bt_p_msg which occur at or after |
| 156 | a given time (in nanoseconds) from its |
| 157 | \ref api-tir-clock-cls-origin "clock class origin". |
| 158 | |
| 159 | When you call bt_message_iterator_seek_ns_from_origin() to perform |
| 160 | the operation, your pass the specific time to seek as the |
| 161 | \bt_p{ns_from_origin} parameter. You don't pass any |
| 162 | \bt_clock_cls: the function operates at the nanosecond from some |
| 163 | origin level and it is left to the message iterator's implementation |
| 164 | to seek a message having at least this time. |
| 165 | |
| 166 | If the requested time point is \em after the message iterator's |
| 167 | sequence's last message, then the next call to |
| 168 | bt_message_iterator_next() returns |
| 169 | #BT_MESSAGE_ITERATOR_NEXT_STATUS_END. |
| 170 | |
| 171 | If bt_message_iterator_seek_ns_from_origin() returns something |
| 172 | else than #BT_MESSAGE_ITERATOR_SEEK_NS_FROM_ORIGIN_STATUS_OK, you |
| 173 | \em cannot call bt_message_iterator_next() afterwards. In that case, |
| 174 | you can only call bt_message_iterator_seek_ns_from_origin() again |
| 175 | or bt_message_iterator_seek_beginning(). |
| 176 | |
| 177 | Before you call bt_message_iterator_seek_ns_from_origin() to make |
| 178 | the message iterator seek a specific point in time, check if it can |
| 179 | currently do it with bt_message_iterator_can_seek_ns_from_origin(). |
| 180 | </dd> |
| 181 | </dl> |
| 182 | */ |
| 183 | |
| 184 | /*! @{ */ |
| 185 | |
| 186 | /*! |
| 187 | @name Type |
| 188 | @{ |
| 189 | |
| 190 | @typedef struct bt_message_iterator bt_message_iterator; |
| 191 | |
| 192 | @brief |
| 193 | Message iterator. |
| 194 | |
| 195 | @} |
| 196 | */ |
| 197 | |
| 198 | /*! |
| 199 | @name Creation |
| 200 | @{ |
| 201 | */ |
| 202 | |
| 203 | /*! |
| 204 | @brief |
| 205 | Status code for bt_message_iterator_create_from_message_iterator(). |
| 206 | */ |
| 207 | typedef enum bt_message_iterator_create_from_message_iterator_status { |
| 208 | /*! |
| 209 | @brief |
| 210 | Success. |
| 211 | */ |
| 212 | BT_MESSAGE_ITERATOR_CREATE_FROM_MESSAGE_ITERATOR_STATUS_OK = __BT_FUNC_STATUS_OK, |
| 213 | |
| 214 | /*! |
| 215 | @brief |
| 216 | Out of memory. |
| 217 | */ |
| 218 | BT_MESSAGE_ITERATOR_CREATE_FROM_MESSAGE_ITERATOR_STATUS_MEMORY_ERROR = __BT_FUNC_STATUS_MEMORY_ERROR, |
| 219 | |
| 220 | /*! |
| 221 | @brief |
| 222 | Other error. |
| 223 | */ |
| 224 | BT_MESSAGE_ITERATOR_CREATE_FROM_MESSAGE_ITERATOR_STATUS_ERROR = __BT_FUNC_STATUS_ERROR, |
| 225 | } bt_message_iterator_create_from_message_iterator_status; |
| 226 | |
| 227 | /*! |
| 228 | @brief |
| 229 | Creates a message iterator on the \bt_iport \bt_p{port} from |
| 230 | another message iterator \bt_p{self_message_iterator}, and sets |
| 231 | \bt_p{*message_iterator} to the resulting message iterator. |
| 232 | |
| 233 | On success, the message iterator's position is at the beginning |
| 234 | of its \ref api-msg-seq "message sequence". |
| 235 | |
| 236 | @param[in] self_message_iterator |
| 237 | Other message iterator from which to create the message iterator. |
| 238 | @param[in] port |
| 239 | Input port on which to create the message iterator. |
| 240 | @param[out] message_iterator |
| 241 | <strong>On success</strong>, \bt_p{*message_iterator} is a new |
| 242 | message iterator reference. |
| 243 | |
| 244 | @retval #BT_MESSAGE_ITERATOR_CREATE_FROM_MESSAGE_ITERATOR_STATUS_OK |
| 245 | Success. |
| 246 | @retval #BT_MESSAGE_ITERATOR_CREATE_FROM_MESSAGE_ITERATOR_STATUS_MEMORY_ERROR |
| 247 | Out of memory. |
| 248 | @retval #BT_MESSAGE_ITERATOR_CREATE_FROM_MESSAGE_ITERATOR_STATUS_ERROR |
| 249 | Other error, for example, the created message iterator's |
| 250 | \ref api-msg-iter-cls-meth-init "initialization method" failed. |
| 251 | |
| 252 | @bt_pre_not_null{self_message_iterator} |
| 253 | @bt_pre_not_null{port} |
| 254 | @pre |
| 255 | <code>bt_port_is_connected(port)</code> returns #BT_TRUE. |
| 256 | @bt_pre_not_null{message_iterator} |
| 257 | |
| 258 | @sa bt_message_iterator_create_from_sink_component() — |
| 259 | Creates a message iterator from a \bt_sink_comp. |
| 260 | */ |
| 261 | extern bt_message_iterator_create_from_message_iterator_status |
| 262 | bt_message_iterator_create_from_message_iterator( |
| 263 | bt_self_message_iterator *self_message_iterator, |
| 264 | bt_self_component_port_input *port, |
| 265 | bt_message_iterator **message_iterator); |
| 266 | |
| 267 | /*! |
| 268 | @brief |
| 269 | Status code for bt_message_iterator_create_from_sink_component(). |
| 270 | */ |
| 271 | typedef enum bt_message_iterator_create_from_sink_component_status { |
| 272 | /*! |
| 273 | @brief |
| 274 | Success. |
| 275 | */ |
| 276 | BT_MESSAGE_ITERATOR_CREATE_FROM_SINK_COMPONENT_STATUS_OK = __BT_FUNC_STATUS_OK, |
| 277 | |
| 278 | /*! |
| 279 | @brief |
| 280 | Out of memory. |
| 281 | */ |
| 282 | BT_MESSAGE_ITERATOR_CREATE_FROM_SINK_COMPONENT_STATUS_MEMORY_ERROR = __BT_FUNC_STATUS_MEMORY_ERROR, |
| 283 | |
| 284 | /*! |
| 285 | @brief |
| 286 | Other error. |
| 287 | */ |
| 288 | BT_MESSAGE_ITERATOR_CREATE_FROM_SINK_COMPONENT_STATUS_ERROR = __BT_FUNC_STATUS_ERROR, |
| 289 | } bt_message_iterator_create_from_sink_component_status; |
| 290 | |
| 291 | /*! |
| 292 | @brief |
| 293 | Creates a message iterator on the \bt_iport \bt_p{port} from the |
| 294 | \bt_sink_comp \bt_p{self_component_sink}, and sets |
| 295 | \bt_p{*message_iterator} to the resulting message iterator. |
| 296 | |
| 297 | On success, the message iterator's position is at the beginning |
| 298 | of its \ref api-msg-seq "message sequence". |
| 299 | |
| 300 | @param[in] self_component_sink |
| 301 | Sink component from which to create the message iterator. |
| 302 | @param[in] port |
| 303 | Input port on which to create the message iterator. |
| 304 | @param[out] message_iterator |
| 305 | <strong>On success</strong>, \bt_p{*message_iterator} is a new |
| 306 | message iterator reference. |
| 307 | |
| 308 | @retval #BT_MESSAGE_ITERATOR_CREATE_FROM_MESSAGE_ITERATOR_STATUS_OK |
| 309 | Success. |
| 310 | @retval #BT_MESSAGE_ITERATOR_CREATE_FROM_MESSAGE_ITERATOR_STATUS_MEMORY_ERROR |
| 311 | Out of memory. |
| 312 | @retval #BT_MESSAGE_ITERATOR_CREATE_FROM_MESSAGE_ITERATOR_STATUS_ERROR |
| 313 | Other error, for example, the created message iterator's |
| 314 | \ref api-msg-iter-cls-meth-init "initialization method" failed. |
| 315 | |
| 316 | @bt_pre_not_null{self_component_sink} |
| 317 | @bt_pre_not_null{port} |
| 318 | @pre |
| 319 | <code>bt_port_is_connected(port)</code> returns #BT_TRUE. |
| 320 | @bt_pre_not_null{message_iterator} |
| 321 | |
| 322 | @sa bt_message_iterator_create_from_message_iterator() — |
| 323 | Creates a message iterator from another message iterator. |
| 324 | */ |
| 325 | extern bt_message_iterator_create_from_sink_component_status |
| 326 | bt_message_iterator_create_from_sink_component( |
| 327 | bt_self_component_sink *self_component_sink, |
| 328 | bt_self_component_port_input *port, |
| 329 | bt_message_iterator **message_iterator); |
| 330 | |
| 331 | /*! @} */ |
| 332 | |
| 333 | /*! |
| 334 | @name Component access |
| 335 | @{ |
| 336 | */ |
| 337 | |
| 338 | /*! |
| 339 | @brief |
| 340 | Borrows the \bt_comp which provides the \bt_msg_iter |
| 341 | \bt_p{message_iterator}. |
| 342 | |
| 343 | @param[in] message_iterator |
| 344 | Message iterator from which to borrow the component which provides |
| 345 | it. |
| 346 | |
| 347 | @returns |
| 348 | Component which provides \bt_p{message_iterator}. |
| 349 | |
| 350 | @bt_pre_not_null{message_iterator} |
| 351 | */ |
| 352 | extern bt_component * |
| 353 | bt_message_iterator_borrow_component( |
| 354 | bt_message_iterator *message_iterator); |
| 355 | |
| 356 | /*! @} */ |
| 357 | |
| 358 | /*! |
| 359 | @name "Next" operation (get next messages) |
| 360 | @{ |
| 361 | */ |
| 362 | |
| 363 | /*! |
| 364 | @brief |
| 365 | Status code for bt_message_iterator_next(). |
| 366 | */ |
| 367 | typedef enum bt_message_iterator_next_status { |
| 368 | /*! |
| 369 | @brief |
| 370 | Success. |
| 371 | */ |
| 372 | BT_MESSAGE_ITERATOR_NEXT_STATUS_OK = __BT_FUNC_STATUS_OK, |
| 373 | |
| 374 | /*! |
| 375 | @brief |
| 376 | End of iteration. |
| 377 | */ |
| 378 | BT_MESSAGE_ITERATOR_NEXT_STATUS_END = __BT_FUNC_STATUS_END, |
| 379 | |
| 380 | /*! |
| 381 | @brief |
| 382 | Try again. |
| 383 | */ |
| 384 | BT_MESSAGE_ITERATOR_NEXT_STATUS_AGAIN = __BT_FUNC_STATUS_AGAIN, |
| 385 | |
| 386 | /*! |
| 387 | @brief |
| 388 | Out of memory. |
| 389 | */ |
| 390 | BT_MESSAGE_ITERATOR_NEXT_STATUS_MEMORY_ERROR = __BT_FUNC_STATUS_MEMORY_ERROR, |
| 391 | |
| 392 | /*! |
| 393 | @brief |
| 394 | Other error. |
| 395 | */ |
| 396 | BT_MESSAGE_ITERATOR_NEXT_STATUS_ERROR = __BT_FUNC_STATUS_ERROR, |
| 397 | } bt_message_iterator_next_status; |
| 398 | |
| 399 | /*! |
| 400 | @brief |
| 401 | Returns the next \bt_p_msg of the message iterator |
| 402 | \bt_p{message_iterator} into the \bt_p{*messages} array of size |
| 403 | \bt_p{*count}, effectively advancing \bt_p{message_iterator}. |
| 404 | |
| 405 | See \ref api-msg-iter-op-next "this operation's documentation". |
| 406 | |
| 407 | On success, the message iterator's position is advanced by \bt_p{*count} |
| 408 | messages. |
| 409 | |
| 410 | @param[in] message_iterator |
| 411 | Message iterator from which to get the next messages. |
| 412 | @param[out] messages |
| 413 | @parblock |
| 414 | <strong>On success</strong>, \bt_p{*messages} is an array containing |
| 415 | the next messages of \bt_p{message_iterator} as its first elements. |
| 416 | |
| 417 | \bt_p{*count} is the number of messages in \bt_p{*messages}. |
| 418 | |
| 419 | The library allocates and manages this array, but until you |
| 420 | perform another \ref api-msg-iter-ops "operation" on |
| 421 | \bt_p{message_iterator}, you are free to modify it. For example, |
| 422 | you can set its elements to \c NULL if your use case needs it. |
| 423 | |
| 424 | You own the references of the messages this array contains. In |
| 425 | other words, you must put them with bt_message_put_ref() or move |
| 426 | them to another message array (from a |
| 427 | \link api-msg-iter-cls-meth-next "next" method\endlink) |
| 428 | before you perform another operation on \bt_p{message_iterator} or |
| 429 | before \bt_p{message_iterator} is destroyed. |
| 430 | @endparblock |
| 431 | @param[out] count |
| 432 | <strong>On success</strong>, \bt_p{*count} is the number of messages |
| 433 | in \bt_p{*messages}. |
| 434 | |
| 435 | @retval #BT_MESSAGE_ITERATOR_NEXT_STATUS_OK |
| 436 | Success. |
| 437 | @retval #BT_MESSAGE_ITERATOR_NEXT_STATUS_END |
| 438 | End of iteration. |
| 439 | @retval #BT_MESSAGE_ITERATOR_NEXT_STATUS_AGAIN |
| 440 | Try again. |
| 441 | @retval #BT_MESSAGE_ITERATOR_NEXT_STATUS_MEMORY_ERROR |
| 442 | Out of memory. |
| 443 | @retval #BT_MESSAGE_ITERATOR_NEXT_STATUS_ERROR |
| 444 | Other error. |
| 445 | |
| 446 | @bt_pre_not_null{message_iterator} |
| 447 | @bt_pre_not_null{messages} |
| 448 | @bt_pre_not_null{count} |
| 449 | |
| 450 | @post |
| 451 | <strong>On success</strong>, \bt_p{*count} ≥ 1. |
| 452 | */ |
| 453 | extern bt_message_iterator_next_status |
| 454 | bt_message_iterator_next(bt_message_iterator *message_iterator, |
| 455 | bt_message_array_const *messages, uint64_t *count); |
| 456 | |
| 457 | /*! @} */ |
| 458 | |
| 459 | /*! |
| 460 | @name Seeking |
| 461 | @{ |
| 462 | */ |
| 463 | |
| 464 | /*! |
| 465 | @brief |
| 466 | Status code for bt_message_iterator_can_seek_beginning(). |
| 467 | */ |
| 468 | typedef enum bt_message_iterator_can_seek_beginning_status { |
| 469 | /*! |
| 470 | @brief |
| 471 | Success. |
| 472 | */ |
| 473 | BT_MESSAGE_ITERATOR_CAN_SEEK_BEGINNING_STATUS_OK = __BT_FUNC_STATUS_OK, |
| 474 | |
| 475 | /*! |
| 476 | @brief |
| 477 | Try again. |
| 478 | */ |
| 479 | BT_MESSAGE_ITERATOR_CAN_SEEK_BEGINNING_STATUS_AGAIN = __BT_FUNC_STATUS_AGAIN, |
| 480 | |
| 481 | /*! |
| 482 | @brief |
| 483 | Out of memory. |
| 484 | */ |
| 485 | BT_MESSAGE_ITERATOR_CAN_SEEK_BEGINNING_STATUS_MEMORY_ERROR = __BT_FUNC_STATUS_MEMORY_ERROR, |
| 486 | |
| 487 | /*! |
| 488 | @brief |
| 489 | Other error. |
| 490 | */ |
| 491 | BT_MESSAGE_ITERATOR_CAN_SEEK_BEGINNING_STATUS_ERROR = __BT_FUNC_STATUS_ERROR, |
| 492 | } bt_message_iterator_can_seek_beginning_status; |
| 493 | |
| 494 | /*! |
| 495 | @brief |
| 496 | Returns whether or not the message iterator \bt_p{message_iterator} |
| 497 | can currently seek its beginning (first \bt_msg). |
| 498 | |
| 499 | See the \link api-msg-iter-op-seek-beg "seek beginning" |
| 500 | operation\endlink. |
| 501 | |
| 502 | Make sure to call this function, without performing any other |
| 503 | \ref api-msg-iter-ops "operation" on \bt_p{message_iterator}, before you |
| 504 | call bt_message_iterator_seek_beginning(). |
| 505 | |
| 506 | @param[in] message_iterator |
| 507 | Message iterator from which to to get whether or not it can seek |
| 508 | its beginning. |
| 509 | @param[out] can_seek_beginning |
| 510 | <strong>On success</strong>, \bt_p{*can_seek_beginning} is #BT_TRUE |
| 511 | if \bt_p{message_iterator} can seek its beginning. |
| 512 | |
| 513 | @retval #BT_MESSAGE_ITERATOR_CAN_SEEK_BEGINNING_STATUS_OK |
| 514 | Success. |
| 515 | @retval #BT_MESSAGE_ITERATOR_CAN_SEEK_BEGINNING_STATUS_AGAIN |
| 516 | Try again. |
| 517 | @retval #BT_MESSAGE_ITERATOR_CAN_SEEK_BEGINNING_STATUS_MEMORY_ERROR |
| 518 | Out of memory. |
| 519 | @retval #BT_MESSAGE_ITERATOR_CAN_SEEK_BEGINNING_STATUS_ERROR |
| 520 | Other error. |
| 521 | |
| 522 | @bt_pre_not_null{message_iterator} |
| 523 | @bt_pre_not_null{can_seek_beginning} |
| 524 | |
| 525 | @sa bt_message_iterator_seek_beginning() — |
| 526 | Makes a message iterator seek its beginning. |
| 527 | */ |
| 528 | extern bt_message_iterator_can_seek_beginning_status |
| 529 | bt_message_iterator_can_seek_beginning( |
| 530 | bt_message_iterator *message_iterator, |
| 531 | bt_bool *can_seek_beginning); |
| 532 | |
| 533 | /*! |
| 534 | @brief |
| 535 | Status code for bt_message_iterator_seek_beginning(). |
| 536 | */ |
| 537 | typedef enum bt_message_iterator_seek_beginning_status { |
| 538 | /*! |
| 539 | @brief |
| 540 | Success. |
| 541 | */ |
| 542 | BT_MESSAGE_ITERATOR_SEEK_BEGINNING_STATUS_OK = __BT_FUNC_STATUS_OK, |
| 543 | |
| 544 | /*! |
| 545 | @brief |
| 546 | Try again. |
| 547 | */ |
| 548 | BT_MESSAGE_ITERATOR_SEEK_BEGINNING_STATUS_AGAIN = __BT_FUNC_STATUS_AGAIN, |
| 549 | |
| 550 | /*! |
| 551 | @brief |
| 552 | Out of memory. |
| 553 | */ |
| 554 | BT_MESSAGE_ITERATOR_SEEK_BEGINNING_STATUS_MEMORY_ERROR = __BT_FUNC_STATUS_MEMORY_ERROR, |
| 555 | |
| 556 | /*! |
| 557 | @brief |
| 558 | Other error. |
| 559 | */ |
| 560 | BT_MESSAGE_ITERATOR_SEEK_BEGINNING_STATUS_ERROR = __BT_FUNC_STATUS_ERROR, |
| 561 | } bt_message_iterator_seek_beginning_status; |
| 562 | |
| 563 | /*! |
| 564 | @brief |
| 565 | Makes the message iterator \bt_p{message_iterator} seek its |
| 566 | beginning (first \bt_msg). |
| 567 | |
| 568 | See \ref api-msg-iter-op-seek-beg "this operation's documentation". |
| 569 | |
| 570 | Make sure to call bt_message_iterator_can_seek_beginning(), |
| 571 | without performing any other \ref api-msg-iter-ops "operation" on |
| 572 | \bt_p{message_iterator}, before you call this function. |
| 573 | |
| 574 | @param[in] message_iterator |
| 575 | Message iterator to seek to its beginning. |
| 576 | |
| 577 | @retval #BT_MESSAGE_ITERATOR_SEEK_BEGINNING_STATUS_OK |
| 578 | Success. |
| 579 | @retval #BT_MESSAGE_ITERATOR_SEEK_BEGINNING_STATUS_AGAIN |
| 580 | Try again. |
| 581 | @retval #BT_MESSAGE_ITERATOR_SEEK_BEGINNING_STATUS_MEMORY_ERROR |
| 582 | Out of memory. |
| 583 | @retval #BT_MESSAGE_ITERATOR_SEEK_BEGINNING_STATUS_ERROR |
| 584 | Other error. |
| 585 | |
| 586 | @bt_pre_not_null{message_iterator} |
| 587 | @pre |
| 588 | <code>bt_message_iterator_can_seek_beginning(message_iterator)</code> |
| 589 | returns #BT_TRUE. |
| 590 | |
| 591 | @sa bt_message_iterator_can_seek_beginning() — |
| 592 | Returns whether or not a message iterator can currently seek its |
| 593 | beginning. |
| 594 | */ |
| 595 | extern bt_message_iterator_seek_beginning_status |
| 596 | bt_message_iterator_seek_beginning( |
| 597 | bt_message_iterator *message_iterator); |
| 598 | |
| 599 | /*! |
| 600 | @brief |
| 601 | Status code for bt_message_iterator_can_seek_ns_from_origin(). |
| 602 | */ |
| 603 | typedef enum bt_message_iterator_can_seek_ns_from_origin_status { |
| 604 | /*! |
| 605 | @brief |
| 606 | Success. |
| 607 | */ |
| 608 | BT_MESSAGE_ITERATOR_CAN_SEEK_NS_FROM_ORIGIN_STATUS_OK = __BT_FUNC_STATUS_OK, |
| 609 | |
| 610 | /*! |
| 611 | @brief |
| 612 | Try again. |
| 613 | */ |
| 614 | BT_MESSAGE_ITERATOR_CAN_SEEK_NS_FROM_ORIGIN_STATUS_AGAIN = __BT_FUNC_STATUS_AGAIN, |
| 615 | |
| 616 | /*! |
| 617 | @brief |
| 618 | Out of memory. |
| 619 | */ |
| 620 | BT_MESSAGE_ITERATOR_CAN_SEEK_NS_FROM_ORIGIN_STATUS_MEMORY_ERROR = __BT_FUNC_STATUS_MEMORY_ERROR, |
| 621 | |
| 622 | /*! |
| 623 | @brief |
| 624 | Other error. |
| 625 | */ |
| 626 | BT_MESSAGE_ITERATOR_CAN_SEEK_NS_FROM_ORIGIN_STATUS_ERROR = __BT_FUNC_STATUS_ERROR, |
| 627 | } bt_message_iterator_can_seek_ns_from_origin_status; |
| 628 | |
| 629 | /*! |
| 630 | @brief |
| 631 | Returns whether or not the message iterator \bt_p{message_iterator} |
| 632 | can currently seek a \bt_msg occurring at or after |
| 633 | \bt_p{ns_from_origin} nanoseconds from its |
| 634 | \ref api-tir-clock-cls-origin "clock class origin". |
| 635 | |
| 636 | See the \link api-msg-iter-op-seek-ns "seek ns from origin" |
| 637 | operation\endlink. |
| 638 | |
| 639 | Make sure to call this function, without performing any other |
| 640 | \ref api-msg-iter-ops "operation" on \bt_p{message_iterator}, before you |
| 641 | call bt_message_iterator_seek_ns_from_origin(). |
| 642 | |
| 643 | @param[in] message_iterator |
| 644 | Message iterator from which to to get whether or not it can seek |
| 645 | its beginning. |
| 646 | @param[in] ns_from_origin |
| 647 | Requested time point to seek. |
| 648 | @param[out] can_seek_ns_from_origin |
| 649 | <strong>On success</strong>, \bt_p{*can_seek_ns_from_origin} is |
| 650 | #BT_TRUE if \bt_p{message_iterator} can seek a message occurring at |
| 651 | or after \bt_p{ns_from_origin} nanoseconds from its clock class |
| 652 | origin. |
| 653 | |
| 654 | @retval #BT_MESSAGE_ITERATOR_CAN_SEEK_NS_FROM_ORIGIN_STATUS_OK |
| 655 | Success. |
| 656 | @retval #BT_MESSAGE_ITERATOR_CAN_SEEK_NS_FROM_ORIGIN_STATUS_AGAIN |
| 657 | Try again. |
| 658 | @retval #BT_MESSAGE_ITERATOR_CAN_SEEK_NS_FROM_ORIGIN_STATUS_MEMORY_ERROR |
| 659 | Out of memory. |
| 660 | @retval #BT_MESSAGE_ITERATOR_CAN_SEEK_NS_FROM_ORIGIN_STATUS_ERROR |
| 661 | Other error. |
| 662 | |
| 663 | @bt_pre_not_null{message_iterator} |
| 664 | @bt_pre_not_null{can_seek_ns_from_origin} |
| 665 | |
| 666 | @sa bt_message_iterator_seek_ns_from_origin() — |
| 667 | Makes a message iterator seek a message occurring at or after |
| 668 | a given time from its clock class origin. |
| 669 | */ |
| 670 | |
| 671 | extern bt_message_iterator_can_seek_ns_from_origin_status |
| 672 | bt_message_iterator_can_seek_ns_from_origin( |
| 673 | bt_message_iterator *message_iterator, |
| 674 | int64_t ns_from_origin, bt_bool *can_seek_ns_from_origin); |
| 675 | |
| 676 | /*! |
| 677 | @brief |
| 678 | Status code for bt_message_iterator_seek_ns_from_origin(). |
| 679 | */ |
| 680 | typedef enum bt_message_iterator_seek_ns_from_origin_status { |
| 681 | /*! |
| 682 | @brief |
| 683 | Success. |
| 684 | */ |
| 685 | BT_MESSAGE_ITERATOR_SEEK_NS_FROM_ORIGIN_STATUS_OK = __BT_FUNC_STATUS_OK, |
| 686 | |
| 687 | /*! |
| 688 | @brief |
| 689 | Try again. |
| 690 | */ |
| 691 | BT_MESSAGE_ITERATOR_SEEK_NS_FROM_ORIGIN_STATUS_AGAIN = __BT_FUNC_STATUS_AGAIN, |
| 692 | |
| 693 | /*! |
| 694 | @brief |
| 695 | Out of memory. |
| 696 | */ |
| 697 | BT_MESSAGE_ITERATOR_SEEK_NS_FROM_ORIGIN_STATUS_MEMORY_ERROR = __BT_FUNC_STATUS_MEMORY_ERROR, |
| 698 | |
| 699 | /*! |
| 700 | @brief |
| 701 | Other error. |
| 702 | */ |
| 703 | BT_MESSAGE_ITERATOR_SEEK_NS_FROM_ORIGIN_STATUS_ERROR = __BT_FUNC_STATUS_ERROR, |
| 704 | } bt_message_iterator_seek_ns_from_origin_status; |
| 705 | |
| 706 | /*! |
| 707 | @brief |
| 708 | Makes the message iterator \bt_p{message_iterator} seek a \bt_msg |
| 709 | occurring at or after \bt_p{ns_from_origin} nanoseconds from its |
| 710 | \ref api-tir-clock-cls-origin "clock class origin". |
| 711 | |
| 712 | See \ref api-msg-iter-op-seek-ns "this operation's documentation". |
| 713 | |
| 714 | Make sure to call bt_message_iterator_can_seek_ns_from_origin(), |
| 715 | without performing any other \ref api-msg-iter-ops "operation" on |
| 716 | \bt_p{message_iterator}, before you call this function. |
| 717 | |
| 718 | @param[in] message_iterator |
| 719 | Message iterator to seek to a message occurring at or after |
| 720 | \bt_p{ns_from_origin} nanoseconds from its clock class origin. |
| 721 | @param[in] ns_from_origin |
| 722 | Time point to seek. |
| 723 | |
| 724 | @retval #BT_MESSAGE_ITERATOR_SEEK_NS_FROM_ORIGIN_STATUS_OK |
| 725 | Success. |
| 726 | @retval #BT_MESSAGE_ITERATOR_SEEK_NS_FROM_ORIGIN_STATUS_AGAIN |
| 727 | Try again. |
| 728 | @retval #BT_MESSAGE_ITERATOR_SEEK_NS_FROM_ORIGIN_STATUS_MEMORY_ERROR |
| 729 | Out of memory. |
| 730 | @retval #BT_MESSAGE_ITERATOR_SEEK_NS_FROM_ORIGIN_STATUS_ERROR |
| 731 | Other error. |
| 732 | |
| 733 | @bt_pre_not_null{message_iterator} |
| 734 | @pre |
| 735 | <code>bt_message_iterator_can_seek_ns_from_origin(message_iterator, ns_from_origin)</code> |
| 736 | returns #BT_TRUE. |
| 737 | |
| 738 | @sa bt_message_iterator_can_seek_ns_from_origin() — |
| 739 | Returns whether or not a message iterator can currently seek a |
| 740 | message occurring at or after a given time from its clock class |
| 741 | origin. |
| 742 | */ |
| 743 | extern bt_message_iterator_seek_ns_from_origin_status |
| 744 | bt_message_iterator_seek_ns_from_origin( |
| 745 | bt_message_iterator *message_iterator, |
| 746 | int64_t ns_from_origin); |
| 747 | |
| 748 | /*! @} */ |
| 749 | |
| 750 | /*! |
| 751 | @name Configuration |
| 752 | @{ |
| 753 | */ |
| 754 | |
| 755 | /*! |
| 756 | @brief |
| 757 | Returns whether or not the message iterator \bt_p{message_iterator} |
| 758 | can seek forward. |
| 759 | |
| 760 | A message iterator can seek forward if all the \bt_p_msg of its |
| 761 | message sequence have some \bt_cs. |
| 762 | |
| 763 | @param[in] message_iterator |
| 764 | Message iterator of which to get whether or not it can seek forward. |
| 765 | |
| 766 | @returns |
| 767 | #BT_TRUE if \bt_p{message_iterator} can seek forward. |
| 768 | |
| 769 | @sa bt_self_message_iterator_configuration_set_can_seek_forward() — |
| 770 | Sets whether or not a message iterator can seek forward. |
| 771 | */ |
| 772 | extern bt_bool |
| 773 | bt_message_iterator_can_seek_forward( |
| 774 | bt_message_iterator *message_iterator); |
| 775 | |
| 776 | /*! @} */ |
| 777 | |
| 778 | /*! |
| 779 | @name Reference count |
| 780 | @{ |
| 781 | */ |
| 782 | |
| 783 | /*! |
| 784 | @brief |
| 785 | Increments the \ref api-fund-shared-object "reference count" of |
| 786 | the message iterator \bt_p{message_iterator}. |
| 787 | |
| 788 | @param[in] message_iterator |
| 789 | @parblock |
| 790 | Message iterator of which to increment the reference count. |
| 791 | |
| 792 | Can be \c NULL. |
| 793 | @endparblock |
| 794 | |
| 795 | @sa bt_message_iterator_put_ref() — |
| 796 | Decrements the reference count of a message iterator. |
| 797 | */ |
| 798 | extern void bt_message_iterator_get_ref( |
| 799 | const bt_message_iterator *message_iterator); |
| 800 | |
| 801 | /*! |
| 802 | @brief |
| 803 | Decrements the \ref api-fund-shared-object "reference count" of |
| 804 | the message iterator \bt_p{message_iterator}. |
| 805 | |
| 806 | @param[in] message_iterator |
| 807 | @parblock |
| 808 | Message iterator of which to decrement the reference count. |
| 809 | |
| 810 | Can be \c NULL. |
| 811 | @endparblock |
| 812 | |
| 813 | @sa bt_message_iterator_get_ref() — |
| 814 | Increments the reference count of a message iterator. |
| 815 | */ |
| 816 | extern void bt_message_iterator_put_ref( |
| 817 | const bt_message_iterator *message_iterator); |
| 818 | |
| 819 | /*! |
| 820 | @brief |
| 821 | Decrements the reference count of the message iterator |
| 822 | \bt_p{_message_iterator}, and then sets \bt_p{_message_iterator} |
| 823 | to \c NULL. |
| 824 | |
| 825 | @param _message_iterator |
| 826 | @parblock |
| 827 | Message iterator of which to decrement the reference count. |
| 828 | |
| 829 | Can contain \c NULL. |
| 830 | @endparblock |
| 831 | |
| 832 | @bt_pre_assign_expr{_message_iterator} |
| 833 | */ |
| 834 | #define BT_MESSAGE_ITERATOR_PUT_REF_AND_RESET(_message_iterator) \ |
| 835 | do { \ |
| 836 | bt_message_iterator_put_ref(_message_iterator); \ |
| 837 | (_message_iterator) = NULL; \ |
| 838 | } while (0) |
| 839 | |
| 840 | /*! |
| 841 | @brief |
| 842 | Decrements the reference count of the message iterator \bt_p{_dst}, |
| 843 | sets \bt_p{_dst} to \bt_p{_src}, and then sets \bt_p{_src} to |
| 844 | \c NULL. |
| 845 | |
| 846 | This macro effectively moves a message iterator reference from the |
| 847 | expression \bt_p{_src} to the expression \bt_p{_dst}, putting the |
| 848 | existing \bt_p{_dst} reference. |
| 849 | |
| 850 | @param _dst |
| 851 | @parblock |
| 852 | Destination expression. |
| 853 | |
| 854 | Can contain \c NULL. |
| 855 | @endparblock |
| 856 | @param _src |
| 857 | @parblock |
| 858 | Source expression. |
| 859 | |
| 860 | Can contain \c NULL. |
| 861 | @endparblock |
| 862 | |
| 863 | @bt_pre_assign_expr{_dst} |
| 864 | @bt_pre_assign_expr{_src} |
| 865 | */ |
| 866 | #define BT_MESSAGE_ITERATOR_MOVE_REF(_dst, _src) \ |
| 867 | do { \ |
| 868 | bt_message_iterator_put_ref(_dst); \ |
| 869 | (_dst) = (_src); \ |
| 870 | (_src) = NULL; \ |
| 871 | } while (0) |
| 872 | |
| 873 | /*! @} */ |
| 874 | |
| 875 | /*! @} */ |
| 876 | |
| 877 | #ifdef __cplusplus |
| 878 | } |
| 879 | #endif |
| 880 | |
| 881 | #endif /* BABELTRACE2_GRAPH_MESSAGE_ITERATOR_H */ |